I have a 1994 320 with a 3-Blade composite MT prop. I need to get more weight on the nose due to aft CG that got worse after an engine overhaul (already have an 11 lbs dampener up front). I was thinking about going to the Hartzell HC-F2YL-1F/F8468D-14 prop but am not crazy about the 70" diameter. Several questions here:
1) Any other way to get more weight up front that I am not thinking of?
2) should I not worry so much about aft CG and just keep my speed up?
3) Should I not worry about taxiing with a prop with very little ground clearance?
4)Other question I should be asking?
Thanks, in advance.
JB
320 Propeller
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tomthibault
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My battery is on the firewall (engine side). If that is too hard and yours is anywhere behind the current CG, just swap it to an earthX
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Ryan Riley
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You can ballast up front to add weight, or switch to a metal prop. I agree that Earth X will free up some CG and weight if it is mounted behind the cabin.
-Ryan
Lancair LNC2/Legacy/ES/ES-P Instructor
LOBO Webmaster
2007 Lancair ES
Lancair LNC2/Legacy/ES/ES-P Instructor
LOBO Webmaster
2007 Lancair ES
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Chris Zavatson
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Big tail or small tail. That drives the answer to the CG question.waggoner.jb wrote: ↑Wed Feb 08, 2023 8:49 pm I have a 1994 320 with a 3-Blade composite MT prop. I need to get more weight on the nose due to aft CG that got worse after an engine overhaul (already have an 11 lbs dampener up front). I was thinking about going to the Hartzell HC-F2YL-1F/F8468D-14 prop but am not crazy about the 70" diameter. Several questions here:
1) Any other way to get more weight up front that I am not thinking of?
2) should I not worry so much about aft CG and just keep my speed up?
3) Should I not worry about taxiing with a prop with very little ground clearance?
4)Other question I should be asking?
Thanks, in advance.
JB
Flew 24 years with 68: diameter, now 70".
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waggoner.jb
- Posts: 3
- Joined: Wed Feb 08, 2023 6:55 pm
I missed this until now - not sure why. I have the small tail section.
JB
JB
Adding weight is never the best answer.
Can you....
Move the battery forward, or use an EarthX lithium battery if it is behind the CG?
Move the hydraulic pump forward if it is behind the aft bulkhead?
Have you measured the CG location and found that it needs to move for your loadings?
BTW, the published CG range of the 235 is too far aft. I revised mine forward by 0.5" after test flying near the aft stability limit.
The published CG range with the Mk2 tail does not extend far enough aft.
Can you....
Move the battery forward, or use an EarthX lithium battery if it is behind the CG?
Move the hydraulic pump forward if it is behind the aft bulkhead?
Have you measured the CG location and found that it needs to move for your loadings?
BTW, the published CG range of the 235 is too far aft. I revised mine forward by 0.5" after test flying near the aft stability limit.
The published CG range with the Mk2 tail does not extend far enough aft.